1; RUN: llc < %s -verify-machineinstrs -verify-coalescing
2;
3; This function has a PHI with one undefined input. Verify that PHIElimination
4; inserts an IMPLICIT_DEF instruction in the predecessor so all paths to the use
5; pass through a def.
6
7%struct.xx_stack = type { i32, %struct.xx_stack* }
8
9define i32 @push(%struct.xx_stack* %stack) nounwind uwtable readonly ssp {
10entry:
11  %tobool1 = icmp eq %struct.xx_stack* %stack, null
12  br i1 %tobool1, label %for.end, label %for.body
13
14for.body:
15  %stack.addr.02 = phi %struct.xx_stack* [ %0, %for.body ], [ %stack, %entry ]
16  %next = getelementptr inbounds %struct.xx_stack, %struct.xx_stack* %stack.addr.02, i64 0, i32 1
17  %0 = load %struct.xx_stack*, %struct.xx_stack** %next, align 8
18  %tobool = icmp eq %struct.xx_stack* %0, null
19  br i1 %tobool, label %for.end, label %for.body
20
21for.end:
22  %top.0.lcssa = phi %struct.xx_stack* [ undef, %entry ], [ %stack.addr.02, %for.body ]
23  %first = getelementptr inbounds %struct.xx_stack, %struct.xx_stack* %top.0.lcssa, i64 0, i32 0
24  %1 = load i32, i32* %first, align 4
25  ret i32 %1
26}
27